<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>box_shadow</title>
	<style type="text/css">
		div {
			width: 800px;
			height: 500px;
			background: red;
			margin:0 auto;
			box-shadow:50px 30px 0 0 yellow;/*水平偏移，竖直偏移30像素 模糊0 扩展0*/
		}
	</style>
</head>
<body>
	<div></div>
</body>
</html>